Today the Allentown teen pleaded guilty to simple assault and disorderly conduct -- after spending 15 weeks to the day in Lehigh County Prison. In exchange for the plea prosecutors withdrew charges of aggravated assault and harassment

Lehigh County Judge James Anthony gave Williams a sentence of time served to one year in prison, but said he didn't like having to do it.

"I don't like that this is in criminal court," Anthony said.

Williams said he was listening to music when teacher Noel Powell asked him to turn the volume down. Court records say Williams was being defiant.

Williams said eventually Powell told him to turn it down or leave. Powell told police he was walking Williams into
a behavior center when Williams tried to push past him, records say.

Powell
walked Williams into the center when Williams took off his jacket,
grabbed Powell's shirt and stepped up to the teacher chest-to-chest and
forehead-to-forehead, records say.

Powell used his forearm to separate from Williams and then the student swung at Powell, who ducked, records say.

"I just snapped" said Williams, of the 100 block of West Chew Street. Part of the issue was that Williams wasn't taking his medication for bi-polar disorder, and he also has been diagnosed with attention deficit hyperactivity disorder, he said.

Williams has been in prison since his arrest Dec. 18 in lieu of $20,000 bail. He won't be released until he has a parole plan in place, Lehigh County Assistant District Attorney Anna-Kristie Morffi Marks said.